Matthew Henry on 2 Chronicles 20:20-30
We have here the foregoing prayer answered and the foregoing promise performed, in the total overthrow of the enemies' forces and the triumph (for so it was rather than a victory) of Jehoshaphat's forces over them.
I. Never was army drawn out to the field of battle as Jehoshaphat's was. He had soldiers ready prepared for war (Ch2 17:18), but here is no notice taken of their military equipment, their swords or spears, their shields or bows. But Jehoshaphat took care, 1. That faith should be their armour. As they went forth, instead of calling them to handle their arms, and stand to them, to keep ranks, observe orders, and fight valiantly, he bade them believe in the Lord God and give credit t…
Read the whole note in the consoleJamieson-Fausset-Brown on 2 Chronicles 20:24
when Judah came toward the watchtower in the wilderness--Most probably the conical hill, Jebel Fereidis, or Frank Mountain, from the summit of which they obtained the first view of the scene of slaughter. Jehoshaphat and his people found the field strewed with dead bodies, so that they had not to fight at all, but rather to take possession of an immense booty, the collection of which occupied three days. On the fourth they set out on their return to Jerusalem in the same order and joyful mood as they came. The place where they mustered previous to departure was, from their public thanksgiving service, called, "The Valley of Berachah" ("benediction"), now Wady Bereikut.
Adam Clarke on 2 Chronicles 20:29
The Lord fought - "The Word of the Lord made war against the enemies of Israel." - Targum.
John Gill on 2 Chronicles 20:29
And the fear of God was on all the kingdoms of these countries,.... Whose armies were slain, and all other neighbouring ones; for the word these is supplied:
when they had heard that the Lord fought against the enemies of Israel; and they were afraid to invade their land, or make war with them; nor did the Edomites dare to revolt in the times of Jehoshaphat.